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split,filter,length solution in Clear category for Follow Instructions by Sim0000
import assert from "assert";
function follow(instructions: string): [number, number] {
const f = c => instructions.split('').filter(x => x == c).length; // count c in instructions
return [f('r') - f('l'), f('f') - f('b')];
}
console.log('Example:');
console.log(follow('fflff'));
// These "asserts" are used for self-checking
assert.deepEqual(follow('fflff'), [-1, 4]);
assert.deepEqual(follow('ffrff'), [1, 4]);
assert.deepEqual(follow('fblr'), [0, 0]);
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May 22, 2020